Carpenter's principles of human physiology . lymphoid patches are usually vascularized, but the former do not originally con-tain blood-vessels, though they subsequently become highly vascular; by coal-escence they idtimately form large tracts. It is thus apparent that there is aconsiderable amount of adenoid tissue imbedded in, or rather forming thewalls of, the serous membranes. The proper lymphatics of serous membranesform wide vessels, which partly accompany and sometimes invaginate or sur-round, and partly run independently of the blood-vessels, and their wallsconsist of
Carpenter's principles of human physiology . lymphoid patches are usually vascularized, but the former do not originally con-tain blood-vessels, though they subsequently become highly vascular; by coal-escence they idtimately form large tracts. It is thus apparent that there is aconsiderable amount of adenoid tissue imbedded in, or rather forming thewalls of, the serous membranes. The proper lymphatics of serous membranesform wide vessels, which partly accompany and sometimes invaginate or sur-round, and partly run independently of the blood-vessels, and their wallsconsist of only one layer of fusiform endothelial plates. The larger onesgenerally have valves and sacculated dilatations. The existence of stomataor openings on the surface of the serous membranes leading into lymphaticvessels, and forming therefore a communication between the cavity of theserous sac and the interior of the lymphatic vessels, has been clearly demon-strated. Dr. Klein distinguishes two kinds, the true and the false. The true, Fig. The large omentum of a young Rabbit, impregnated, without removal, with nitrateof silver.—t, holes in the membrane ; a, contours of cells situated on the upper surface ;b, contours of cells situated on the lower surface; c, c, small intercalated cells ; m, massesof protoplasm stained with silver nitrate on the upper surface; m, the same on thelower surface. which are ciliated in the female frog and toad, are either the mouths of verticallymphatic channels, which are lined by a special layer of polyhedral cells con-taining granular protoplasm, and lead into the lumen of a superficial lym-phatic vessel, or they represent a discontinuity between the endothelial cells ofthe surface leading into a simple lymphatic sinus near the surface, lined on 198 OF ABSORPTION AND SANGUIFICATION. one side only with epithelium. The false or pseudo-stomata are perpendicularprocesses which extend from the superficial cells of the cell-network of thematrix of
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectphysiology, bookyear1
